Revenues - Summary of Deferred Revenue from Contract with Customers (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Dec. 31, 2018	Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]
Recognition of deferred revenue	$ 747	$ 1,417
Deferred Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Recognition of deferred revenue	$ 267	$ 421

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration